The North American Aviation XB-70 Valkyrie is a retired prototype version of the planned B-70 nuclear-armed, deep-penetration supersonic strategic bomber for the United States Air Force Strategic Air Command.

Conceived in the 1950s as an intercontinental strategic nuclear bomber, the futuristic Valkyrie instead became a unique test aircraft in the 1960s. Higher and Faster: B-70 Bomber Concept.

2014年2月28日 · The XB-70 Valkyrie, with a planned cruise speed of Mach 3 and operating altitude of 70,000 feet, was to be the ultimate high-altitude, high-speed manned strategic bomber. Events, however, would cause it to play a far different role in the history of aviation.

2020年11月27日 · The Air Force’s XB-70 Valkyrie was the fastest bomber ever developed. What killed it? And could it have been used for another purpose?

2025年1月11日 · Built during the height of the Cold War, the XB-70 was conceived as a supersonic bomber capable of cruising at Mach 3—three times the speed of sound—while delivering nuclear payloads deep into enemy territory. It wasn’t just a bomber; it was a statement of technological dominance.

2009年11月10日 · North American Aviation’s XB-70 fulfilled General Curtis E. LeMay’s dream of a bomber that could penetrate the Soviet Union with impunity, carrying enough ordnance to decide the outcome of a war in a single strike.

2020年3月2日 · Learn all about the history and development of the North American XB-70 Valkyrie, the Mach 3 beauty that led a star-crossed life.

The XB-70 program began in 1955 when the United States Air Force (USAF) issued a request for a high-altitude, long-range bomber with a Mach 3 (three times the speed of sound) dash capability and the ability to carry a heavy nuclear and conventional warload.

2018年5月7日 · Ultimately, the first XB-70 logged eighty-three flights totaling 160 hours and sixteen minutes, while the second XB-70 logged forty-six flights totaling ninety-two hours and twenty-two minutes...

The B-70 bomber program resulted from an Air Force requirement for a high-speed, high-altitude strategic bomber to replace the B-52. North American engineers utilized NACA studies dealing with optimum Mach 3-6 configurations to develop the winning B-70 design (find out more at the Aerospaceweb.org Hypersonic Waveriders site).